Would you like a quality but inexpensive, quick setup, fast cool down, and sharp imaging telescope? The top piece of plywood has three long bolts protruding from it. A 20mm to 32mm, a 10mm to 15mm and a 4mm to 7mm. Most were taken just by holding my digital camera to the eyepiece. At last check, the Cloudy Nights store didn't seem available anymore, so you'll likely have to find a good objective somewhere else. It is a bit more difficult to adjust, but once properly adjusted should hold the adjustment indefinitely.
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The T-ring for my camera has a 42 mm threading and so has my Celestron zoom eyepiece. A screw goes through the clamp and protrudes through the plywood. The rule for finding the maximum useful magnification is to multiply the diameter of the objective in mm x2 or in inches x With its magnesium construction and virtually zero-expansion Sitall mirror, the BBHS showed the quickest cool down characteristics of the three diagonals. It too was taken through the telescope shown on this web page, but using a Celestron NexImage astro-camera. Globular clusters are easily visible in my 60mm telescopes, but most can't be resolved beyond a fuzzy image.
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Now That's a Real Telescope! See my website davetrott. Since the invention of the telescope about years ago, telescope making has always had an amateur component. I use a 45 degree prism instead. There you can select objects from either the Messier, Caldwell, or Herschel target lists, and get updated pointing coordinates to all targets in the selected list. Image Crispness My final tests were relative to how sharp or crisp the views were between the diagonals, and if there were any differences readily visible between them.
One is a 4" the other I believe is a 5? When you first receive a new telescope, it's logical to assume that it's in top shape and ready to start collecting photons. This is a fine system. Putting up the equipment is a snap -- just put the tripod back in the shed and cover the lenses. Easy to use when looking at objects high in the sky. The lenses and focuser I have go with it. That means that the focal length of the telescope is 15 times the diameter of the telescope.